Improvement in scroll-sawing machines



G. MERGER. Scroll Sawing Machine.

N0.]66,I26. Patentedlu|y27,l875.

H. PETERS, PHOTO'LJTHOGRAPHER, WASHINGTON D. c.

UNITED STATES PATENT OFFICE.

GEORGE MERGER, OF ST. LOUIS, MISSOURI.

IMPROVEMENT IN SCROLL-,SAWING MACHINES.

Specification forming part of Letters Patent No. 166,126, dated July 27,1875; application filed July 14, 1874.

To all whom it may concern:

Be it known that I, GEORGE MERCER, of St. Louis, St. Louis county,Missouri, have invented a certain new and useful Improvement inScroll-Sawing Machines, of which the following is a specification:

The first part of my improvement consists in the provision of arotatable head, arm, spring, and twistable or swivel connection, towhich the top of the saw is connected, the said provision allowing ofthe stuff (when extending beyond the edge of the table) being turnedthereupon in any direction. 7

The second part of my invention consists in the manner of constructingthe bearing of the rotatable head. This is shown in Fig. 5, the

bearing-block being conical in transverse section, leaving grooves orchannels for the escape of the sawdust. Two of the grooves dischargeinto the other two, which, in turn, discharge into the recess at theside of the upright.

The third part of my improvement consists in securing the upper end ofthe saw to a reciprocating bar that works in the end of the jointed arm,and which is connected to the stretcher-spring by a cord, catgut, orother rotatable connection, to allow the turning of the head withouttwisting the saw, said arm being attached to the standard of themachine.

The fourth part of my improvement consists in the combination of thejointed rotatable arm and attachment of the upper end of the saw,allowing the disconnection of these parts to admit of the arm beingthrown back, as before mentioned.

The fifth part of my improvement consists in the manner of securing thelower end of the saw in the reciprocating bar from which it receivesmotion. In this is a spring-pin,

' having a return-bend, which passes through the saw, and which isforced out of engagement by pressure against a thumb-knob, whichdepresses a spiral spring. This spring tends to hold the parts to theirengagement by outward pressure against the thumb-knob.

Figure l is a side view of the machine. Fig. 2 is a section showing thetop attachment of the saw. Fig. 3 is a vertical section at a: a, Fig.4.. Fig. 4 is a horizontal section at y 3 Fig. 3. Fig. 5 is aperspective view, showing the bearing-block of the turning head, the topbeing broken off.

A is the stand, which may be made of any suitable form, and which has anupright, B, carrying the balance-wheel 0, turned by a crank, D, pitmanE, and treadle F. The wheel connects by a belt, G, with the pulley Honthe shaft I of the crank-disk J. The treadle-pitman and balance-wheelmay be dispensed with when the machine is driven by power. The crank-pinj is connected by pitman K to the reciprocating bar L, which has avertically-extending groove to receive the point of a screw, M, by whichoscillation of the bar is prevented. The lower end. of the saw enters amortise in the top of the bar L, and is held therein by a springcatch,consisting of a thumb-knob, Z, spiral spring 1 resting in a cavity or}recess in the bar L, and forcing the thumb-knob outward, and ashank, 1which passes diametrically through the bar, and whose end 1 is rebent,and forms the catch which passes through the saw N, and which is held toits engagement by the pressure of the spiral spring beneath thethumb-knob. The saw N extends upward through the table 0, and its upperend is formed into a hook, n, which engages over the pin 1) extendingacross the slot 19 in the lower end of the reciprocating bar P. Theupper end of bar P is connected by cord or catgut (or other rotatableconnection) Q to the end of the stretcher-spring R, by which the saw isdrawn upward. The saw N has teeth upon both edges, so that it may bemade to cut in opposite directions without turning in the kerf. Thespring R is attached to an arm, S, whose end forms the bearing for thesliding block P. This arm S is jointed at s, and extends beneath thetable, where it ends in a head, T, turning on the bearing U, which, withthe horizontal annular flange U, to which the table 0 is attached, formsthe upper end of the upright B. This bearing U has a number'of verticalgrooves, u u the first pair or set a of which communicate at the lowerend with the recess 11 in the upright, and the grooves to communicatewith those u, so that as the sawdust is carried down through the hole 0in the table, it will escape through said grooves and recess. .The headT has an aperture, t, through which the thumb-knob 1 may be reached todisengage the lower end of the saw. The inner face of the bearing-blockU, in which the bar L slides, is slotted at M, to allow the disengagingmovement of the catch-pin.

I claim as my invention- 1. The combination of rotatable bearing collaror head T, beneath and contiguous to the table, arm S, attached to saidhead, and supporting the spring R, swivel-connection Q, and the standardor upright B, substantially as and for the purpose set forth.

2. The bearing U, having grooves u u, to allow the escape of sawdust,substantially as and for the purpose set forth.

3. In a portable scroll-saw, the combination arm S, all constructedsubstantially as and for the purpose set forth.

5. The combination of bar L, push-spring catch 1 l l l, and saw N, allsubstantially as and for the purpose set forth.

GEORGE MERGER. Witnesses:

SAML. KNIGHT, WILLIAM ROTHWELL.

